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In which compound is the percent by mass of oxygen greatest?
A. BeO
B. MgO
C. CaO
D. SrO

Sagot :

Curtiidn
The answer is A
Hide the Oxygen for a minute
Mass of elements:
Be:9.012
Mg:24.305
Ca:40.078
Sr:87.62
Out of all these choices, Be is the lightest

Answer: BeO

Explanation:

percent by mass of oxygen[tex]=\frac{\text {mass of oxygen}}{\text {Total mass of substance}}\times 100\%[/tex]

percent by mass of oxygen in BeO[tex]=\frac{16g}{25.01g/mol}\times 100=63.97\%[/tex]

percent by mass of oxygen in MgO[tex]=\frac{16g}{40.30g/mol}\times 100=39.70\%[/tex]

percent by mass of oxygen in CaO[tex]=\frac{16g}{56.08g/mol}\times 100=28.53\%[/tex]

percent by mass of oxygen in SrO[tex]=\frac{16g}{103.62g/mol}\times 100=15.44\%[/tex]

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